I Had My Last Period On The 18 Of April

i had my last period on the 18 of April took postinor 2 on d 23 and I experience bleeding for 7days.... as an effect of the postinor n m due for my period now I can't find it.... am I pregnant or its delayed period. if its delayed am two days late..if its delayed then I won't c my period this month....ambi pregnant....n my nipples are sensitive